edu.sdsc.inca.depot.persistent
Class InstanceInfoDAO

java.lang.Object
  edu.sdsc.inca.depot.persistent.DAO
      edu.sdsc.inca.depot.persistent.InstanceInfoDAO

public class InstanceInfoDAO
extends DAO

This class transfers InstanceInfo objects between memory and the DB.

Field Summary

Fields inherited from class edu.sdsc.inca.depot.persistent.DAO

logger

Constructor Summary

InstanceInfoDAO()

Method Summary

static InstanceInfo	load(java.lang.Long id) Returns an InstanceInfo object from the DB with the id specified, null if no such object appears in the DB.
static InstanceInfo	loadOrSave(InstanceInfo ii) Returns an InstanceInfo object from the DB with the same field values as one specified, or the saved version of the specified object if no such object appears in the DB.
static InstanceInfo	update(InstanceInfo ii) A wrapper around DAO.update that handles the necessary casting.

Methods inherited from class edu.sdsc.inca.depot.persistent.DAO

save, selectMultiple, selectUnique, update

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

InstanceInfoDAO

public InstanceInfoDAO()

Method Detail

load

public static InstanceInfo load(java.lang.Long id)
                         throws PersistenceException

Returns an InstanceInfo object from the DB with the id specified, null if no such object appears in the DB.

Parameters:

id - the id of the object to be retrieved

Returns:

an object from the DB marked with the given id

Throws:

PersistenceException - on err

loadOrSave

public static InstanceInfo loadOrSave(InstanceInfo ii)
                               throws PersistenceException

Returns an InstanceInfo object from the DB with the same field values as one specified, or the saved version of the specified object if no such object appears in the DB. Synchronized to avoid race conditions that could result in DB duplicates.

Parameters:

ii - an object that contains field values used in the retrieval

Returns:

an object from the DB that contains the same values

Throws:

PersistenceException - on err

update

public static InstanceInfo update(InstanceInfo ii)
                           throws PersistenceException

A wrapper around DAO.update that handles the necessary casting.

Parameters:

ii - the object to update

Returns:

ii for convenience

Throws:

PersistenceException - on error